I am not asking about multi-site. Rather, I am curious if there is existing support for "sharing" data across unique Craft 3 installs.
For instance, let's say he have 2 Craft 3 installs running as headless CMS. Craft CMS A has a Glossary Section with Glossary Term Entries, each Entry localized in English and Spanish. Craft CMS B has a News Section with News Post Entries, each Entry localized in English and Spanish. If these Sections were in the same CMS it would be trivial to include hyperlinks to Glossary Terms in a News Post. But how can I include hyperlinks to CMS A Glossary Terms in CMS B News Posts? Is there native, or existing plugin for creating a "connection" between separate Craft CMS Sections & Entries? I think I'm looking for something like the Connect plugin but at the CMS Dashboard level, rather than in Twig templating.